Hi,
As i am new to lttng usage, I have followed the instructions from
<https://launchpad.net/~lttng/+archive/ppa> in order to install the lttng tool
set in my ubuntu 11.10.
After successful installation, i followed the getting started link on lttng.org
<http://lttng.org/quickstart> in "root mode".
1. when i am executing the first command -
# lttng list -k
i am getting the following error
" Error: Unable to list kernel events"
2. # lttng create mysession
Session mysession created.
3. # lttng enable-event sched_switch,sched_process_fork -k
Error: Event sched_switch: Kernel tracer not available (channel channel0,
session mysession)
Error: Event sched_process_fork: Kernel tracer not available (channel
channel0, session mysession)
Warning: Some command(s) went wrong
4. # lttng start
Tracing started for session mysession
5. # lttng stop
Tracing stopped for session mysession
6. # lttng destroy
Session mysession destroyed at /root
------------
I have checked that lttng-sessiond is running by below command
# ps -ef|grep lttn
root 535 1 0 Jun14 ? 00:00:00 lttng-sessiond
somanath 5359 1 0 Jun14 pts/1 00:00:00 lttng-sessiond --sig-parent
--quiet
root 19514 19495 0 12:44 pts/2 00:00:00 grep --color=auto lttn
--------------
Could anyone please help me to understand or clarify why kernel tracer is not
available when above point (3) / (1) is executed or whether i need to do
anything more , please let me know so that i can start using lttng in ubuntu
11.10 successfully.
I have googled about this problem, I got to know about this similar problem
from one link -
http://www.mail-archive.com/[email protected]/msg00763.html
However i executed all this commands under root and explicit lttng-seesiond
start, But still the problem is persistant.
Any help will be appreciated.
Thanks & Regards,
Somanath
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